Affiliation: | 1. Department of Periodontology, Peking University School and Hospital of Stomatology, Beijing, P.R. China National 2. Clinical Research Center for Oral Diseases, Beijing, P.R. China National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, P.R. China Beijing Key Laboratory of Digital Stomatology, Beijing, P.R. China;3. National 4. Clinical Research Center for Oral Diseases, Beijing, P.R. China National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, P.R. China Beijing Key Laboratory of Digital Stomatology, Beijing, P.R. China Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing, P.R. China;5. Department of Periodontology, Peking University School and Hospital of Stomatology, Beijing, P.R. China |